U.S. Department of State - Bureau of Educational and Cultural Affairs

These book are used by the different Offices of English Language Programs around the world. They may not be pretty, but you would assume they must be good.

http://exchanges.state.gov/englishteaching/index.html

Economic Considerations
Thomas Kral
-advanced
-integrated skills
-ESP, Economics
http://draft.eca.state.gov/education/engteaching/pubs/ESP/1410.htm

Dialogs for Everyday Use
Julia M. Dobson
-intermediate
-listening, speaking
-grammar
http://draft.eca.state.gov/education/engteaching/pubs/LSRW/4159.htm

More Dialogs for Everyday Use
Dean Curry
-intermediate/advanced
-speaking
-grammar
http://draft.eca.state.gov/education/engteaching/pubs/LSRW/4533.htm